Pre-1492 farmers did without fires

Farming without fire in tropical regions, like indigenous populations did in Pre-Columbian times, may be the key to both feeding people and managing land more sustainably.

For hundreds of years before Columbus arrived in Central America, indigenous people converted vast swaths of tropical savannas into agricultural fields with raised beds for growing crops -- all without the use of slash-and-burn or other fire-intensive techniques, which are common today and a major contributor to greenhouse gas emissions.

But soon after 1492, there came a sharp surge in uncontrolled burns throughout the Amazon’s coastal landscapes, found a new study that dug into more than 2,000 years worth of soil. Those carbon-emitting burning practices, which continue today, contribute significantly to global warming....